气力提升管内气泡形变的实验研究

气泡的形变作为气力提升装置的主要影响因素,其形变规律直接影响气力提升装置的提升性能。为此,该文中运用高速摄像仪拍摄了气液两相流流场结构,基于图像处理获取了气泡运动过程中的形状参数,通过气泡匹配技术得到了气泡的运动速度。实验结果表明,改变运行参数会引起气泡碰撞和融合发生机率的变化,进而影响到气泡初始生成体积;气泡运动速度的周期性变化会改变气泡的直径和变形,进而改变管内流型,最终导致气力提升装置的提升性能发生变化。

Experimental study on deformation of bubble in air-lift tube

The deformation of air bubble is the main influence factor for pneumatic lifting device,and its law directly affects the lifting performance of pneumatic lifting device.Therefore,the structure of gas-liquid two phase flow field is captured by high-speed camera,and the shape parameters of bubble motion are obtained based on image processing.Then,the bubble velocity was obtained by the bubble matching technique.Experimental results show that the change of operation parameters can cause the change in the probability of bubble collision and fusion,and then affect the initial volume of the bubble;The periodic change of bubble velocity can cause the changes of diameter and deformation of the bubble,which also can change the flow pattern in the tube,eventually the lifting performance of the pneumatic lifting device was varied.